2.2.2.2 X-AnchorMailbox
The X-AnchorMailbox header identifies the email address of the account for which the configuration information will be retrieved. This header SHOULD be passed if the client sends the X-MapiHttpCapability header.
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The X-AnchorMailbox header identifies the email address of the account for which the configuration information will be retrieved. This header SHOULD be passed if the client sends the X-MapiHttpCapability header.